CVE-2026-23395

Adjacent memory corruption via duplicate L2CAP identifiers

Published Mar 25, 2026 · Updated Mar 25, 2026

Stack buffer overflow in Linux Kernel allows physically proximate attackers to corrupt kernel memory through Bluetooth L2CAP requests. The L2CAP request handler accepts repeated Enhanced Credit Based Connection Requests with the same command identifier, marks multiple channels pending, and lets l2cap_ecred_rsp_defer allocate beyond its five-CID stack array. Bluetooth radio proximity and no pairing or authentication are sufficient; the overflow can compromise kernel confidentiality, integrity, and availability.

CVSS severity8.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Linux Kernel allows physically proximate attackers to corrupt kernel memory through Bluetooth L2CAP requests. The L2CAP request handler accepts repeated Enhanced Credit Based Connection Requests with the same command identifier, marks multiple channels pending, and lets l2cap_ecred_rsp_defer allocate beyond its five-CID stack array. Bluetooth radio proximity and no pairing or authentication are sufficient; the overflow can compromise kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-23395
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <2124d82fd25e1671bb3ceb37998af5aae5903e06
  2. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <5b3e2052334f2ff6d5200e952f4aa66994d09899
  3. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <6b949a6b33cbdf621d9fc6f0c48ac00915dbf514
  4. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <8d0d94f8ba5b3a0beec3b0da558b9bea48018117
  5. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <e72ee455297b794b852e5cea8d2d7bb17312172a
  6. Affected versionversion=15f02b91056253e8cdc592888f431da0731337b8 <fb4a3a26483f3ea2cd21c7a2f7c45d5670600465
  7. Affected versionversion=5.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=15f02b91056253e8cdc592888f431da0731337b8 <2124d82fd25e1671bb3ceb37998af5aae5903e06; version=15f02b91056253e8cdc592888f431da0731337b8 <5b3e2052334f2ff6d5200e952f4aa66994d09899; version=15f02b91056253e8cdc592888f431da0731337b8 <6b949a6b33cbdf621d9fc6f0c48ac00915dbf514; version=15f02b91056253e8cdc592888f431da0731337b8 <8d0d94f8ba5b3a0beec3b0da558b9bea48018117; version=15f02b91056253e8cdc592888f431da0731337b8 <e72ee455297b794b852e5cea8d2d7bb17312172a; version=15f02b91056253e8cdc592888f431da0731337b8 <fb4a3a26483f3ea2cd21c7a2f7c45d5670600465; version=5.7

Published CVSS scores

7.7UbuntuCVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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